Pioneer SM-3000

Commentary

This is a stereo power amplifier with the highest quality specifications with an emphasis on delicate expressions.

All stages are connected directly to the 3-stage Darlington pure complimentary service OCL circuit.
For the output stage, triple diffused silicon NPN and PNP power transistors with collector loss of 100W and matching characteristics and breakdown characteristics are used in parallel. In addition, a two stage differential amplifier is used to stabilize the DC potential, and a temperature compensation circuit is also taken into consideration. The high stability of fluctuation of 0 ± 0.005 V in the range from -15 ℃ to + 55 ℃ is obtained.

It is equipped with a protective circuit that combines an electronic circuit with 9 transistors and 11 diodes and a power relay to protect the speakers from internal damage caused by shorting of the speaker terminals and eddy currents caused by internal accidents.
This circuit automatically recovers when the problem is resolved and returns to normal condition. In addition, it has a lamp indicator that lights in conjunction with the protector so that the condition can be judged from the outside.
This protector circuit also serves as a power muting to eliminate noise at the time of power-on.

Equipped with two input terminals, and input sensitivity is a 4-position switching type.

Equipped with 2-position switchable low-cut filter.

We use carefully selected parts such as power transformers using cut cores, printed circuit boards made of glass epoxy, and high-grade switches.

Equipped with Route 3 speaker outputs.

The actual measurement data that was carefully checked for each unit is attached.

Model Rating

Type	Stereo power amplifier
Circuit system	Pure complimentary service OCL system directly connected to all stages
Music Power (IHF)	400W (4 Ω) 250W (8 Ω)
Effective power	1kHz 20 Hz to 20 kHz Single channel operation : Both channel operation : Both channel operation : 150W/150W (4 Ω) 100W/100W (8 Ω) 130W + 130W (4 Ω) 90W + 90W (8 Ω) 85W + 85W (8 Ω, Distortion Factor 0.1% or Less)
Harmonic distortion factor	0.1% or Less (Effective Output) 0.05% (8 Ω, at 50W/50W output)
Cross modulation distortion factor	0.1% or Less (Effective Output) 0.05% (8 Ω, at 50W/50W output)
Output Bandwidth (IHF)	5 Hz ~ 50 kHz (8 Ω, Distortion Factor 0.1% or Less)
Frequency characteristic	10 Hz ~ 70 kHz + 0 -1dB
Input Sensitivity / Impedance (1 kHz at effective output)	0.5V/50k Ω 1V/60k Ω 2V/60k Ω 5V/60k Ω
Load impedance	4 Ω ~ 16 Ω
Damping factor	100 or More (8 Ω, 1 kHz)
Hum and noise	95 dB or more (IHF, short circuit)
Low filter	7Hz/20Hz Switching Type, 12dB/oct.
Accessory circuit	Input selector (1, 2) Input Sensitivity Selector (0.5 v, 1 v, 2 v, 5 v) Speaker selector (A, B, C, A + B, A + C, B+ C) Protection circuit indicator
Semiconductor used	Transistor : 38 Diode, etc. : 26 pcs
Power outlet	Power switch interlock : 1 system Power switch not linked : 1 system
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	165W (rated) 500W maximum
External dimensions	Width 422x Height 172x Depth 288 mm
Weight	15.1kg
Attachment	Measured data sheet